KR100221841B1 - Multi-connection apparatus of analogue subscriber - Google Patents

Abstract

The present invention relates to an analog subscriber multiple access device in a satellite communication system, which is capable of connecting a plurality of private exchanges using satellite communication and five standard E & M signaling methods coupled thereto with one access board. A satellite communication system having a plurality of base stations coupled with a central control station for controlling the base stations via satellites; Input means for inputting type information of an arbitrary analog subscriber, first hook detection means for recognizing a hook detection signal input from a general subscriber side, and second hook detection means for recognizing a hook detection signal input from a private branch exchange side. A third hook detection means for recognizing a hook detection signal input from the private branch exchange side, a switching means for switching operation based on a predetermined control signal, and the switching based on analog subscriber information input through the input means. And means for controlling switching to transmit and receive the E & M signal with the corresponding analog subscriber based on the hook detection signal detected from the first to third hook detection means.

Description

Analog subscriber multiple access device in satellite communication system

The present invention relates to a communication system using satellites, and in particular, a satellite subscriber and a general subscriber or five private exchanges using five standard E & M (Ear & Mouth) signaling schemes can be connected as one access board. The present invention relates to an analog subscriber multiple access device in a satellite communication system.

Recently, with the rapid development of communication technology, satellite communication, which enables subscribers who are located at remote sites to make calls through satellites, has become increasingly common. Since such satellite communication does not require a separate signal line for a call, It is mainly used as a long distance communication between countries or as a communication method in a mountainous country such as Korea.

In the above-mentioned satellite communication, there are two types of PAMA (Pre Assignment Multiple Access) method for allocating communication channels for each subscriber according to the channel allocation method and Demand Assignment Multiful Access (DAMA) method for allocating communication channels according to subscriber's request. In general, in the satellite communication system for communication between subscribers, many DAMA methods are adopted in consideration of the cost and the effectiveness of the communication channel.

1 is a block diagram showing the overall system configuration of a general satellite communication system according to the DAMA method.

In Fig. 1, reference numeral 1 is a satellite having a plurality of communication channels, 2 is a central control station for controlling the entire satellite communication system, and 3 (3A, 3B) is an exchanger (11A, 11B) or a telephone (12A, 12B). And interface functions for terminals such as data terminals 13A and 13B and facsimile 14A and 14B, such as a computer, and communication between the various terminals through data transmission and reception with the central control station 2. It provides a base station.

In FIG. 1, reference numeral S denotes a service channel for transmitting and receiving control data, and T denotes a traffic channel for transmitting and receiving data or voice.

In the above-described configuration, the central control station 2 transmits a control message through a service channel in a normal state and then, based on a response message sent from the base station 3, that is, communication It performs a polling function to check the available capacity or the utilization status of the communication channel. When there is a call request from a specific base station, for example, the base station 3A to the terminal of the base station 3B, it is determined whether the corresponding base station 3B is in a state in which communication is possible based on the information obtained in the polling process. In the case of the communicable state, the available traffic channel T of the satellite is allocated to both base stations 3A and 3B so that both base stations 3A and 3B can directly communicate with each other.

Subsequently, when the communication between the base stations 3A and 3B is terminated and the communication termination signal is applied through the service channel S from the base station 3A, which has been requested for communication, the central control station 2 is applied to both base stations. By executing the communication termination process, the traffic channel T which has been provided to both base stations 3A and 3B is released.

2 is a block diagram schematically showing the configuration of the base station 3 described above.

In the figure, reference numeral 21 denotes an antenna for transmitting and receiving satellite 1, an uplink signal, and a downlink signal, and 22 denotes a high frequency signal received from the antenna 21 and then It is an RF processor for performing a series of signal processing on the intermediate frequency signal input from the IF combination / distributor 23 to be described.

In addition, reference numeral 23 separates and outputs the intermediate frequency signal applied from the RF processor 22 into a plurality of intermediate frequency signals, and is applied from the SCPC (Single Channel Per Carrier) channel unit 24 to be described later. IF combination / distributer for combining and outputting the intermediate frequency signal, 24 demodulates, decodes and outputs the intermediate frequency signal applied from the IF combination / distributor 23, which will be described later. SCPC channel unit for encoding, modulating and outputting a message output from the base station control unit 20.

Here, the IF combination / distributor 23 is employed for system scalability when using a plurality of SCPC channel units.

Further, reference numeral 30 denotes an available traffic channel of the satellite allocated from the central control station 2 after generating a predetermined S-ALOHA message and sending it to the central control station 2 when there is a call request from the subscriber. And a base station control unit for controlling communication between subscribers based on a modem, and 40 is directly connected to a satellite subscriber or a specific private exchange, and performs a series of call processing operations based on a control signal from the base station controller 30. A telephone data card to be performed, which is capable of accommodating a plurality of voice communication subscribers and data communication subscribers at the same time.

That is, in the above configuration, the base station control unit 30 generates a predetermined S-ALOHA message according to the call request when the call request from the subscriber or private exchange subscriber through the telephone data card 40 generates SCPC The channel unit 24 transmits the data to the central control station 2. Subsequently, when the base station controller 30 receives an available traffic channel and modem from the central control station 2, the base station controller 30 performs a series of control operations to control the subscribers to perform communication with each other by setting the subscribers to a callable state. do.

On the other hand, the private branch exchange (PABX) is connected to the telephone data card 40 of the base station 3 to receive the service of the satellite communication system, the signaling method is known as the E & M signaling method as the standard five types ( Type). This E & M signaling method refers to, for example, an E signal, an M signal, an SB (signal battery) signal, and an SG in connection with a call processing between a calling station and a called station (e.g., a telephony data card and a private branch exchange are considered to be different powers). (Signal Ground) Transmit and receive signals to perform a series of call processing. Here, the E signal and the SB signal are the signals output to the power station, and the M signal and the SG signal are the signals input from the power station.

In the five standard types of the E & M signaling scheme, E & M type 1 and type 5 use only E signals and M signals, and E & M type 2 to type 4 use E signals, M signals, SB signals, and SG signals.

For example, in order to output the E signal from the telephone data card 40 in the E & M type 2, a predetermined board controller outputs the ground voltage input from the private branch exchange as it is to the private branch exchange, and is -48V. SB signal is output to the private branch exchange side.

Then, the telephone data card 40 waits for a predetermined response signal from the private branch exchange side. The private branch exchange exchanges the -48V SB signal inputted from the telephone data card 40 as it is. In addition to the output (SG signal), the E signal of -48V is output to the telephone data card 40 side. At this time, the signal on the telephone data card 40 side becomes the M signal.

Similar to the above E & M Type 2, each of four E & M type private branch exchanges is operated.

On the other hand, the private premises exchange uses any one of the five types of E & M signaling methods, and thus the configuration of the connection board provided in the telephone data card 40 connected to the private premises exchange must be different. In order to be combined with the type, it is necessary to have a connection board corresponding to each E & M type. That is, by separately developing access boards for general telephone subscribers and E & M signaling subscribers for each type, the service for each type is bound to be selected.

Accordingly, the present invention has been made in view of the above, and it is possible to connect a satellite communication system and a general subscriber or multiple private exchanges using standard five types of E & M signaling schemes as one access board. An object of the present invention is to provide an analog subscriber multiple access device in a satellite communication system.

1 is an overall system configuration for explaining the outline of a general satellite communication system.

2 is a block diagram showing the configuration of the base station 3 in FIG.

3 is a block diagram of an analog subscriber multiple access device in a satellite communication system according to an embodiment of the present invention;

4 is a reference view of FIG. 3;

* Brief description of the main parts of the drawing

1: satellite 2: central control station

3A, 3B: base station 11A, 11B: switchboard

12A, 12B: Telephone 13A, 13B: Data Terminal

14A, 14B: Facsimile 21: Antenna

22: RF processing unit 23: IF combination / distribution unit

24: SCPC channel unit (SCU) 30: base station control unit

40: Telephony Data Card (TDC) 10: Processor

11: subscriber data setting unit 12: switch control logic

13: multiplexer 14: general subscriber hook detection unit

15: first hook detection unit 16: second detection unit

17, 18, 19: switch

In the satellite communication system according to the present invention for realizing the above object, the analog subscriber multiple access device includes a plurality of base stations combined with a plurality of subscribers and a central control station for controlling the base stations through satellites. ; Input means for inputting type information of an arbitrary analog subscriber, first hook detection means for recognizing a hook detection signal input from a general subscriber side, and second hook detection means for recognizing a hook detection signal input from a private branch exchange side. A third hook detection means for recognizing a hook detection signal input from the private branch exchange side, a switching means for switching operation based on a predetermined control signal, and the switching based on analog subscriber information input through the input means. And means for controlling switching to transmit and receive the E & M signal with the corresponding analog subscriber based on the hook detection signal detected from the first to third hook detection means.

That is, as described above, by connecting the general subscriber or the five types of private branch exchanges through one connection board, the flexibility and utility of the in-network subscriber configuration can be greatly improved.

Next, with reference to the accompanying drawings will be described in detail an embodiment according to the present invention.

3 is a block diagram showing the configuration of an analog subscriber multiple access device in a satellite communication system according to an embodiment of the present invention.

In Domain, reference numeral 10 denotes a processor as a control unit that performs overall control of the analog subscriber multiple access device according to the present invention, and 11 denotes the operator based on information on the E & M type of the general subscriber or any private branch exchange. It is a subscriber data setting unit configured as a dip switch so as to set an operation state of the switches S1 to S6 to be described. Here, when an operator inputs information of a specific analog subscriber by operating the dip switch, the processor 10 performs a series of switching control based on the input data.

In addition, reference numeral 12 denotes a switch control logic for controlling a switching operation for the switches S1 to S6 based on a predetermined control signal from the processor 10, and 13 denotes a plurality of input terminals. Multiplexer (MUX) for selectively outputting the signal to one output terminal based on the input signal, 14 is a general subscriber detection unit for detecting the hook-off for the hook-off signal input from the general satellite network subscriber side 15 is a first hook detection unit for detecting a -48V or ground signal input from the private branch exchange side, and 16 is a second hook detection unit for detecting a current which changes according to a series of operations on the private branch exchange side.

Here, when the first and second hook detectors 15 and 16 detect a signal input from the private branch exchange (the detected signal is generally referred to as a hook-off signal), the predetermined result signal according to the above is detected. Output to the multiplexer 13.

Further, reference numerals 17 and 18 denote switches for performing a predetermined switching operation based on the control signal from the switch control logic 12, and 19 denotes a switch for switching the E signal input from the processor 100. In response to the switching operation of the switch 19, the E signal generated from the processor 10 is outputted to the private branch exchange side.

Next, the operation of the device having the above configuration will be described with reference to FIG.

For example, in order to provide a service to a general subscriber, an operator must set up information on the general subscriber by operating the subscriber data setting unit 11 configured as the dip switch. In order to provide satellite communication service to the general subscriber, the operator opens all the switches S1 to S6 for signal transmission and reception with the private branch exchange side as shown in FIG.

Subsequently, the processor 10 outputs a predetermined control signal to the multiplexer 13 based on the subscriber data set by the operator to process a series of call processing only for the hook detection signal input from the general subscriber hook detection unit 14. Will be controlled.

In addition, when the private branch exchange that applies the signaling method of the E & M type 2 is connected, in order to provide communication service to the private branch exchange, the operator has two switches (S3) as shown in the " E & M Type 2 " , S4 should be driven for connection, and the remaining switches S1, S2, S5, S6 should be opened. That is, the operator operates the dip switch of the subscriber data setting unit 11 to set it, and the processor 10 outputs a predetermined control signal to the switch control logic 12 based on the set subscriber data. Based on this control signal, the switch control logic 12 performs predetermined switching control on the switches S1 to S6.

When the switches S1 to S6 are controlled as described above, -48V is input from the multiple access device 40 to the private branch exchange through the SB signal line, and grounded through the SG signal line from the private branch exchange to the multiple access device side. It is. At this time, when a predetermined M signal (E signal on the private branch exchange side) is inputted from the private branch exchange side, the switch S6 is opened, so that the predetermined hook detection signal is received by the first hook detection unit 15. Become recognized.

That is, as described above, the input M signal for the E signal output from the counterpart private branch exchange in the state in which the switches S1 to S6 are driven (-48 V outputted through the SB signal line from the multiple connection apparatus by connecting the S3 switch). When is input, the first hook detection unit 15 detects this and inputs the multiplexer 13. In this case, since the processor 10 is aware of the type of the private branch exchange that is currently connected based on the data input from the subscriber data setting unit 11, the processor 10 transmits a predetermined control signal to the multiplexer 13 to transmit the predetermined control signal. 1 The hook detection signal from the hook detection unit 15 is input.

Thereafter, the processor 10 drives the switch 19 to output the E signal. In this case, the ground signal input from the private branch exchange through the SG signal line is output as the E signal to the private branch exchange.

As described above, another type of private branch exchange may also transmit and receive an E & M signal according to a control signal of the processor 10 based on the subscriber information input from the subscriber data setting unit 11.

That is, as described above, by connecting five types of private branch exchanges through one access board, flexibility and utility of the in-network subscriber configuration can be greatly improved.

On the other hand, the present invention is not limited to the above embodiments and can be implemented in various modifications without departing from the technical rights of the present invention.

As described above, according to the present invention, satellite communication and general subscribers coupled to the satellites or a plurality of private exchanges using five standard E & M (Ear & Mouth) signaling schemes can be connected as one access board. Analog subscriber multiple access devices can be realized in communication systems.

Claims (1)

A satellite communication system having a plurality of base stations combined with a plurality of subscribers and a central control station for controlling the base stations through satellites; Input means for inputting type information of an arbitrary subscriber; First hook detection means for recognizing a hook detection signal input from the general subscriber's side, Second hook detecting means for recognizing a hook detecting signal input from the private branch exchange side, Third hook detecting means for recognizing a hook detecting signal input from the private branch exchange side, Switching means for switching operation based on a predetermined control signal; Switching control of the switching means based on the analog subscriber information input through the input means, and control to transmit and receive an E & M signal with the analog subscriber based on the hook detection signals detected from the first to third hook detection means. Analog subscriber multiple access device in a satellite communication system, characterized in that it comprises a control means.